Method for recoating RTV anti-pollution flashover coating on insulator coated with RTV anti-pollution flashover coating

Abstract

Disclosed is a method for recoating an RTV anti-pollution flashover coating on an insulator coated with the RTV anti-pollution flashover coating. The insulator includes an insulator body, a steel cap connected to an upper surface of the insulator body, and a steel pin connected to a lower surface of the insulator body. The method includes: (1) wiping off dirt on a surface of the insulator; (2) determining whether the insulator can be recoated; (3) performing coating by using an RTV anti-pollution flashover coating with the content of solid being 55%-65%. After coating is performed, a newly coated anti-pollution flashover coating can be closely adhered to a surface of the insulator, swelling does not occur, adhesion of the coating with respect to the insulator is not reduced, the hydrophobicity of the surface is recovered, and non-reduction of a pollution flashover voltage of the insulator is ensured.

Description

[0001]This application is a continuation in part of PCT / CN2014 / 001042, filed on Nov. 24, 2014. The contents of PCT / CN2014 / 001042 are all hereby incorporated by reference.BACKGROUND[0002]Technical Field[0003]The present application relates to the processing of an insulator in a power system, and in particular, to a method for recoating an RTV anti-pollution flashover coating on an insulator coated with the RTV anti-pollution flashover coating.[0004]Related Art[0005]In a power system, using a room temperature vulcanized silicone anti-pollution flashover coating (RTV anti-pollution flashover coating for short) is a very important anti-pollution flashover measure. Coating an RTV anti-pollution flashover coating on a surface of an insulator can significantly improve the hydrophobicity of the insulator, and further increases a pollution flashover voltage of the insulator and prevents a pollution flashover accident. However, the RTV anti-pollution flashover coating has a relatively poor we...

AI Technical Summary

Benefits of technology

The recoating method effectively recovers hydrophobicity and adhesion, ensuring non-reduction in pollution flashover voltage and preventing the need for insulator replacement, while maintaining the original coating's integrity and adhesion.

Problems solved by technology

However, the RTV anti-pollution flashover coating has a relatively poor weather resistance performance, and aging of the RTV anti-pollution flashover coating occurs in a long-running process due to influences of factors such as electric field, light, and high humidity.

However, this processing measure causes high costs and a waste of insulators.

Meanwhile, an impact and a swelling damage to the original coating caused by a recoating process is avoided, for example, if a spraying pressure is excessively high, the excessively high pressure causes an impact on a surface of the original coating, affects adhesion of the original coating with respect to an insulator, and further affects adhesion of a coating of the newly coated RTV anti-pollution flashover coating; if a pressure is excessively low, the excessively low pressure affects a spraying effect; if the standing time at the same position is excessively long, a solvent causes partial swelling of the original coating; if the mass content of solid of the coating is excessively low, the excessively low mass content of solid causes the swelling of the original coating; if the mass content of solid is excessively high, the excessively high mass content of solid affects an atomization effect during the spraying.

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